matching

1. Matching in discovery nested case-control study

Hi, I want to identify differentially expressed RNAs in cases versus controls from a cohort study. First, I would like to identify promising candidate RNAs in a study on 10 cases versus 10 controls. Then I would validate them in the larger cohort. What would be the best way to match cases and...
2. How to check gender and age matching

Hello girls and guys, I have worked on a study for which I was blinded in the first part. I always assumed that the patients and controls were gender and age matched because I was told so. Now I have the list of birth dates and gender affiliation and I would like to state in my paper/thesis...
3. Guidance for using propensity score matching in R

I am new to programming as well as econometrics and would like to ask some guidance for learning. I am planning to calculate the effectiveness of a public works scheme in country A. By effectiveness I mean the rate of success by which participants were able to return to the open labour market...
4. Finding my control group PSM, Matching or regression model and correct for confounder

Hey there, First off I'm hoping I'm posting this in the right place. I'm doing research where there is a patient group of n=9 that underwent our new treatment. Whilst there is a group of n=140 that underwent the regular treatment. Now my prof. wants me to find the 18 most matching...
5. Propensity score matching - pre-treatment outcome variable

Hi all, maybe this rather a silly question but I have not found anything helpful. I have two groups of samples which are basically a treatment and control group. My task at hand is to compare a certain variable between those two groups, which however is not appearing after the treatment...
6. SPSS Fuzzy matching with a date range

Hi all! I am trying to match cases and controls. I would like to match on sex, age (+/- 3 years), and date of accident (+/- 6 months). I have been using the SPSS fuzzy function to match and have entered 0 and 3 (0 3) but cannot work out how to specify the 6 months fuzzy range for dates...
7. Pairing cases (case-control matching)

I have administered a questionnaire for my patient sample and for controls. I want to match the patient scores to the scores of controls, but I am totally lost on how to do this with SPSS. I have tried the Case Control Matching command, but I get this warning all the time: "Warnings List of fuzz...
8. Problems with matched sampling using SAS

Hi, I tried to find matched control matches to multiple variables: 1) age +/- 10 years and 2) diabetes I used the codes as shown below (Ref:http://www.lexjansen.com/pharmasug/2000/Posters/p07.pdf. However, in matched control only diabetes=NO were selected. At first I thought maybe due...
9. Question about population matching procedure

Good evening everyone, I am currently conducting a clinical trial where I am taking an intervention population (which is referred to a new service) and comparing hospital readmission rates to historical controls. Because the intervention group will be more likely to meet the primary outcome...
10. Using regression to compensate for matching?

Suppose I am using four groups for a study: South Asian patients, n=41 First Nation patients, n=48 Arabic patients, n=26 South Asian controls, n=70 The controls do not match for age and gender to any o:cool:f the patient groups. However, if I show through regression analysis that...
11. Match firms by sic code and ipo date in state

Hi, I am currently researching the US Ipo market and due to stata being completely new for me I encountered the following problem: I have two data sets in which each the variables company name, ipo date and sic code are given. one data set is called: IPO firms. The other one is called peers...
12. GenMatch returns much worse balance stats than Match with defaults?

I am learning to use the Matching package for the first time, and so have been experimenting with some sample data. I first just ran the Match function with my data, with some default values, and got a match that had pretty good balance on most of the variables, but which was not great on a few...